Electrically-operated tool.



F. SCYHNElDER.

ELECTRICALLY OPERATED TOOL.

APPLICATION FILED FEB. 20. 1913.

1,172,169. Patented Feb. 15, 1916.

ZUiZzzessas fax/622102" Horn? 6- THE COLUMBIA PLANOuRAPl-I co..WASHINGTON, D. c.

' ANKLIN SCHNEIDER,pF-ULEVELAND,101310, ASSIGNOB, TO THE VAN'DORN & I

J BUTTON cor/manner CLEVELAND, OHIO, A oonronn'rron or OHIO.

inventions. 7

- To all may concern I Be it known that FRANKLIN Sonnnmnn, a citizen of;the United States, and a -resident of Cleveland, county ofCuyahog'a,'and

JState of Ohio, have invented a new and useful Improvement inElectricallyQperated Tools, of which thefollowing is'a '1 specification,the principle of the 1 invention I being herein explained and the bestmode in which I have contemplated applying that principle, so as todistinguish it fronioth'er .i The subject of the :present invention isan electrically operated tool intended primarily for use in connectionwith drills and the like; It is a matter of;eXtreme-diflicultyin suchtools to secure a'construction o t-casing I and a dispositlonofthe gearsand the bearings which willentirely prevent the introduction. oflubricant into the motor chamher, as lubricant in this chamber will of.

course get into the windings of the; motor and will practically ruin thesame, in a short time.

principle of the invention may beused.

description set forth in detail certain mechanism embodying; theinvention, such disclosed means constituting, however, but one ofvarious mechanicalformsjin which the In saidannexed drawing: Figureljiis a central section on the line l1 Fig. 2, but showing certaindetails in elevation; and Fig. 2 is a section on the line 22, Fig. 1.

The general features of all electrically operated tools of the presenttype arein many respectsvery similar, and the general construction ofthe device shown in Fig. 1 will be, readily apparent and need nottherefore "ELECTRICALLY-OIPERATED root.

' Specification of'Letters Patent. Patented Feb, 15, 1916. Applicationfiled Fehruary 2t),1913. Serial No. 749,646.,

be described in greater detail. A main or motor casing 1 is provided, towhich are attached suitablehandles 2,.in one of which will be disposedthe switch mechanism for throwing into and out'of circuit the motor 3.The switch mechanism is not described in detail in thepresentapplication, as it with a suitable spindle 4, one end of which...

is mountedin bearings 5 at what may be termed the innerend' of themotoncasing, while the other end of the spindle extends exteriorly ofthe open end of the motor easing. Adjacent to such extending end of fthespindle there is attached a memberfi formed of two spacedand'connecteddisks 1 17, such memberbeingkeyed to the motor spindle and being adaptedto serve as .a partition across the open end of the motor, flcasing, andto roughly maintain the eXtending. end of themotor spindle in its properposition, although the member 6 is notinftended to serve as abearingvfor such outer .end of the spindle, since this member is of.

slightly less diameter-thanthe inside of the motor casing. ''.It isdesirable in a device of this type toreduce the speed of the motor, andfor this purpose gears are provided which operatively connect the motorspindle .with a tool receivingshaft 8 which is suitably mounted .torotate inv an auxiliary or second casing: 9 which is removably atvtachedto 'the'motor casing about the open end of the same. This secondcasing 9 is provided with an aperture adaptedjto permit the entrance ofthe extending end of: the motor shaft andis provided ,with a packinggland 10'andwith a ball bearing ll dle and maintains the armature in itsproper operating relation to its field magnet. The

6..is an additional safeguard against .any

such escape of lubricant at least along the which supports the outerendof such spinspindle 4, as such member is in contact with a flange 12formed upon the motor spindle. The functions of the member 6 willtherefore be seen to be the preventing of any slight amount of lubricantleaking through the packing gland in the second casinginto the motorwindings, and also to serve as a support or rest for the outer part ofthe motor spindle when the second casing is removed, and to furtherserve as a fan which is adapted to maintain the interior of the maincasing at a substantially equal temperature by maintaining-a current'ofair therethrough.

The shaft --8 is rotatably mounted "in two spaced plain bearings 13 and14 of generous size, between which there is disposed a thrust ballbearing 15 adapted to take up any lo''ngitudinal pressure exerted uponthis sh-aft' by the action oi the tool which will 'be held in a chuck'16 of familiar construction. Keyedto the tool shaft 8 is a gear 17which is adapted to mesh with and be driven 'by a smaller gear 18attached to a counter shaft 19 rotatably mounted in the second casing.This counter shatt 11.9 provided with a second gear 20 which is engagedby a small gear 21 attached to the end of the motor spindle or formedintegral therewith as may be preferred By this means the, desired gearreduction between the motor spindle and the tool shaft may be secured.

The advantages of the present construction "are the convenience ofassembly secured 35 by means of the second casing which con tains all ofthe gears including the tool shaft, and is adapted to receive the motorspindle through an aperture in the same. This construction permits ofthe removal of the second casing for the purpose of replacing worn gearsor overhauling the same, and also for the purpose of packing this casingwith lubricant for the casing and'the tool shaft. 7

Another feature of the invention to which attention is directed is themethod ofmoun-ting the tool shaft which includes the provision oi thetwo long plain bearings and the disposition between't'he two of thethrust bearings for taking up the longitudinal thrust on this shaftwhich is at times very great.

=Ot'her modes of applying the principle-oi my "invention may be employedinstead of the one explained, change being made as regards the mechanismherem disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed. I

1 therefore particularly point out and distinctly claim as myinvention-:-

FL The combination in an electrically operated tool; of a casingopen atone end;

a motor armature received in said casing,

the spindle of said armature being journaled in the closed end of saidcasing and extending exteriorly of the open end; a second casing;remoi'ably clamped to said motor casing about the open end of the sameand bearing a rotatable shai't adapted to receive a tool; means adaptedto .operatively connect the spindle and the shaft, said means beingcarried entirely in said second casing and being removable therewith;said second casing having one end Wall formed integral therewith andserving as a partition to close the open end of said motor casing, suchend wall being provided with a bearing for the extending end of suchmotor spindle and being adapted to prevent the leakage of lubricant fromsaid second casing into said motor casing. 4

2. The combination in an electrically operated tool; of a casing open atone end; a motor armature received in said casing, the spindle of saidarmature being journaled in the closed end of said casing and extendinge-Xteriorly of the open end; a second-casino; removably clamped to saidmotor casing about the open end of the same and bearing a rotatableshaft adapted to receive a tool; means adapted to oper-atively connectthe spindle and the shaft, said means being carried entirely in saidsecond casing and being removable therewith; said second casing havingone "end wall for-medin'tegral therewith and serving as a partition toclose the open end of said motor casing such end wall being providedwith a bearing for the extending end of such motor spindle and beingadapted to prevent the leakage of lubricant from said second easing intosaid motor casing; and a packing gland for such shaft mounted in the endwall of said second casing beyond such bearing.

The combination in an electrically '-operated tool; of a casing open atone end;

a motor armature received in said casing, the spindle of said armaturebeing journaled in the closed end of said casing and extendingexteriorly oi" the open end; a sec ond casing removably clamped to saidmotor casing about the open end of the same and bea-rm-g a rotatableshaft adapted to receive a tool; means adapted to 'o'peratively connectthe spindle and the shaft, said means being carried entirely in saidsecond casing and being removable therewith; said second casinghavingone end wall serving as a partition to close the open end o said motorcasing, such end wall being provided with a bearing for the extendingend of such motor spindle and being adapted to prevent the leakage oflubricant -from saidsecond casing into said motor casing a packing glandfor such sha ft mounted in end wall of said second casing beyond suchbearing"; and a g (I fan'attztched to such shaftwithin said motor Signedby me, this 18th day of February casing adjacerit'to the open end of thelatt ;v 1912 ter, saidfan fitting loosely Within said'cas-' FRANKLINSCHNEIDER. ing and'serving to support such shaftin Attested by 5 itsproper position before the positioning BURTON W. S EET,

of said second casing. V i 7 GEORGE W. HEINKEL.

, Copies of this patent may be obtained for five cents ea oh,tbyaddressing the Commissioner of Iatents,

Washington, 11.0.

